My Period In The Last Few Months Has Not Been

My period in the last few months has not been matching up with my birth control pill cycle. I had a light period the week before my placebo week on my pills, then had unprotected sex during my placebo week. He did pull out at least. I take my pills decently regularly, sometimes i miss a day and take it the next day though i don't always take it the same time everyday. Basically, i just really need an answer to ease my concerns. What are the chances i'm pregnant?